Sorry if I missed something, I read all the early threads up to page 6 then read the last page.
What surprises me is that we bought our 500 1.2 lounge April 2010 and the stop-start problem had been cured and re-called (Or whatever it's called) according to what I read here.
We have always had an intermittent problem with stop start, considering what I read here the dealer I have dealt with has been surprisingly relaxed about the issue. We have had to have two software updates and a re-call for something to do with air-bags and they didn't correctly re-fit the air-bag cover under the steering wheel. The resulting comments suggested I was being picky and it'll be Ok.
We sort-of got used to it working when it pleases, if the headlamps are on, or in fact any other item that might drop the voltage stop start doesn't work or sometimes does.
So, the problem either has or hasn't been identified and sorted. if it has then our dealer who I already sacked for other reasons couldn't be bothered to fix it.